Cassius m



(No Model.)

0. M. RICHMOND.

ARTIFICIAL TOOTH.

Patenfed May 22,1883.

N. PETERS. finial-Magn fier. Wahingbn. D. C.

- UNITED STATES PATENT OFFICE.

OASSIUS M. RICHMOND, OF NEW YORK, Y., ASSIGNOB TO THE RICHMOND TOOTH GROWN COMPANY, OF SAME PLACE.

ARTIFICIAL TOOTH.

SPECIFICATION forming part of Letters Patent No. 277,937, dated May 22, 1883.

Application filed December 2, 1882.

To all whom it may concern:

Be it known that I, CASSIUS M. RICHMOND, of the city, county, and State of New York, have invented a new and useful Improvement in Artificial Tooth Crowns, of which the following is a full, true, and exact description, reference beinghad to the accompanying drawin gs.

In the preparation of artificial tooth-crown work, especially of the character of that patented to me on the 10th day of February, 1880, No. 224,355, it has been found that the crown will sometimes chip or split or become loose, and the substitution of a new crown thus become necessary. It has heretofore been necessary to remove the ferrule and its attachments from the root, in order to replace the crown but I have devised a method of replacing an artificial crown upon structures of that character, leaving the attaching-ferrule connected with the root. In practice such artificial crowns are attached generally to a backing by solder or similar material. Incase of accident, I remove the crown from such backing or support and drill through the backing one or more holes for the reception of the attaching-holders, which I describe; in my present application.

The construction ofsuch tooth-crown will be 0 readily understood from the drawin gs,'in which Figure 1 represents the tooth crown as prepared ready for application; Fig. 2, a section of the same through the line as m. Fig. 3 represents the attachingcontrivances so arranged 3 5 as to hold the artificial tooth crown in its place. Fig. 4 represents another method of attaching my locking-tubes.

Similar letters refer to similar parts. 0 represents the artificial tooth-crown,which v 40 may be made ofporcelain or other suitable material. In the process of manufacture one or more tubes, preferably two, are fastened in said tooth in the manner shown in Fig. 2. These tubes may bemade of any suitable 5 metal-as, for instance, platinum. The inner (No model.)

ends are spread'out within the porcelain, so as to lock the tube firmly; or the usual pins, as shown in Fig. 4, may be employed, and the tubes slid over them and soldered thereto. By

thismeans the ordinary crown may be used.

I prefer, however, the method shown in Fig. 2.

In order to attachsaid crown to the metallic backing, holes corresponding to the tubes A A are drilled and the crown put in position, said tubes A A projecting through the backing and into the mouth of the cavity. By a suitable instrument, conforming to the shape of the crown and having a mechanical spreading contrivance within, the inner ends of the tubes A A are spread or eyeleted, as shown by B B, thereby locking the tube firmly in position. Larger pins,'similar-to the pins D D shown in Fig. 4, mightbe used and screw-threads cut thereon, and by means of the nuts on the inner ends the crown might be drawn up close to the backing; but I prefer the methodshown in Figs. 1, 2, and 3.

hat Iclaim as my invention, and desire to secure byLet-ters Patent, is-

1. The method of setting artificial porcelain teeth, which consists in drilling through the hard sup iiorting-backing one or more holes corresponding to a supporting pin or pins, and in then spreading or increasing the size ot'said pin or pins at their inner ends for the purpose of locking said porcelain teeth after they are in position,'substantially as described.

2. The combination of an artificial porcelain tooth with one or more tubular locking-pins adapted to be spread at theirinnerends', there- So by locking the crown in position, 'substan tially as described.

3. The combination of an artificial porcelain tooth and a tubular pin attached to a pin baked in the tooth, substantially as described.

O. M. RICHMOND.

Witnesses:

GEo. H. EVANS, ANTHONY GREF, Jr. 

